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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
22 May 2017 - 19 October 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
August 24. 2009
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
March 23, 2006
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
August 1996
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Key result
Temp.:
20 °C
Vapour pressure:
< 0.002 Pa
Remarks on result:
other: No accurate vapour pressure could be calculated. Weight losses of the test item were lower compared to the reference hexachlorobenzene. The vapour pressure of the test item is considered to be lower than the vapour pressure of hexachlorobenzene.
Key result
Temp.:
25 °C
Vapour pressure:
< 0.005 Pa
Remarks on result:
other: No accurate vapour pressure could be calculated. Weight losses of the test item were lower compared to the reference hexachlorobenzene. The vapour pressure of the test item is considered to be lower than the vapour pressure of hexachlorobenzene.

With the data obtained from Experiment 1, Experiment 2, Experiment 3, and Experiment 4, it proved not possible to construct a vapour pressure regression curve. The temperature range chosen for these experiments was too small.

Therefore, a wider temperature range was applied in Experiment 5 and Experiment 6. 

Weight loss was observed from the start of the experiments. In the range of 100°C and 130°C a log p versus 1/T curve for the test item could not be determined since the coefficient of correlation (r) was < 0.99. Because no accurate vapour pressure could be calculated from the obtained results, the weight losses were compared with the results of hexachlorobenzene

The weight loss of the test item at 110°C, 120°C, 130°C and 140°C was lower than the weight loss of the reference substance hexachlorobenzene at the same temperatures. The vapour pressure of the test substance was therefore determined to be lower than that of hexachlorobenzene.

Conclusions:
Using the isothermal thermogravimetric effusion method, the vapour pressure of the substance was determined to be < 4.8 E-3 Pa at 25°C (< 1.5 E-3 Pa at 20°C).
Executive summary:

The study was performed using the isothermal thermogravimetric effusion method in accordance with EC A.4, OECD 104 and OPPTS 830.7950 guidelines and according to the principles of GLP.

Because no accurate vapour pressure could be calculated from the obtained results, the weight losses were compared with the results of hexachlorobenzene The weight loss of the test item at 110°C, 120°C, 130°C and 140°C was lower than the weight loss of the reference substance hexachlorobenzene at the same temperatures. The vapour pressure of the test substance was therefore determined to be lower than that of hexachlorobenzene and was concluded to be < 4.8 E-3 Pa at 25°C (< 1.5 E-3 Pa at 20°C).

Description of key information

Using the isothermal thermogravimetric effusion method, the vapour pressure of the substance was determined to be < 4.8 E-3 Pa at 25°C and < 1.5 E-3 Pa at 20°C.

Key value for chemical safety assessment

Vapour pressure:
0.002 Pa
at the temperature of:
20 °C

Additional information

The study was performed in accordance with EC A.4, OECD 104 and OPPTS 830.7950 guidelines and according to the principles of GLP.

The key value used for the CSA is 0.0015 Pa at 20°C. For the CSA it was needed to calculate the vapour pressure of the substance at elevated temperatures. For this the Clausius-Clapeyron equation was used, as used in CHESAR; Ln (p1/p2) = (50000/8.314) x (1/T2 – 1/T1) with T in Kelvin; p1=0.0015 Pa and T1=293 K. Resulting for instance in a by Chesar calculated vapour pressure of 0.00556 Pa at 40°C.